Yeah, there is an etching on the card in this format XXZZ. XX is the week the card was made, ZZ is the year. I don't know if 02 is possible, but I'm guessing VT made some cards this year 🙂 There is also a sticker on the HSF, seems this number is consistent within 1 or 2 weeks from the etching on the board. Also, you can get a BIOS editor to find out when the BIOS was imaged although this won't necessarily tell you when the card was fabbed. I don't think there's a way to tell from the box itself though. Chances are you'll get a card made after week 43 if your local BB has decent inventory turnover, the Turkey Day sale and all those "smart" people who pre-purchased/PM'd seemed to clear out the old stock.
As for having enough cooling in your case....again, YMMV. I had to cap off my OCing at 250/520 due to the immense heat build-up. I could run at higher speeds, but the heat build-up would cause my system to lock-up and crash, and I have a silly amount of cooling in my case. You can check out my sig for details. Also, I like it pretty warm in my apt. in the winter, so I will probably be able to crank it back up once I switch back to AC, but my temps would shoot up to ~47C when it runs past 250/520 and its around ~39C non-OC'd....~41C at 250/520.
Chiz